CN111951736B - Backlight module, driving method and driving device thereof and display device - Google Patents
Backlight module, driving method and driving device thereof and display device Download PDFInfo
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- CN111951736B CN111951736B CN201910412318.3A CN201910412318A CN111951736B CN 111951736 B CN111951736 B CN 111951736B CN 201910412318 A CN201910412318 A CN 201910412318A CN 111951736 B CN111951736 B CN 111951736B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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Abstract
The disclosure provides a backlight module, a driving method and a driving device of the backlight module, and a display device, and belongs to the technical field of display. The driving method of the backlight module comprises the steps of driving a light source of the backlight module to emit light in each display period; the method for driving the light source of the backlight module to emit light in any display period comprises the following steps: outputting a first driving pulse signal to a light source of the backlight module in a non-driving time period of a display period; outputting a second driving pulse signal to a light source of the backlight module in the driving time period of the display period; wherein the frequency of the first driving pulse signal is greater than the frequency of the second driving pulse signal. The driving method of the backlight module can reduce poor pixel charging and improve the display effect of the liquid crystal module on the premise of not reducing the brightness of the backlight module.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a backlight module, a driving method and a driving device thereof, and a display device.
Background
The large-size liquid crystal display device uses a backlight dimming technology, and brightness change of the backlight module is realized by adjusting the duty ratio and the frequency of PWM (pulse width modulation) so as to match with the liquid crystal module to achieve a certain display effect.
However, the liquid crystal module contains a photosensitive conductor material, and the change of brightness of the backlight module can excite the change of the conductor characteristics of the liquid crystal module, thereby causing the difference of the charging effect of the pixels in different time. This may cause the display device to have an interference phenomenon varying with the backlight, for example, the display device may have scanning lines, which greatly affects the display effect.
The above information disclosed in the background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute prior art that is known to a person of ordinary skill in the art.
Disclosure of Invention
The present disclosure provides a backlight module, a driving method and a driving device thereof, and a display device, which can reduce poor pixel charging and improve the display effect of a liquid crystal module without reducing the brightness of the backlight module.
In order to achieve the purpose, the technical scheme adopted by the disclosure is as follows:
according to a first aspect of the present disclosure, a driving method of a backlight module is provided, which includes driving a light source of the backlight module to emit light in each display period; the method for driving the light source of the backlight module to emit light in any display period comprises the following steps:
outputting a first driving pulse signal to a light source of the backlight module in a non-driving time period of a display period;
outputting a second driving pulse signal to a light source of the backlight module in the driving time period of the display period;
wherein the frequency of the first driving pulse signal is greater than the frequency of the second driving pulse signal.
In an exemplary embodiment of the present disclosure, the non-driving period of any one display period includes a plurality of non-driving sub-periods; outputting a first driving pulse signal to a light source of the backlight module in a non-driving time period of a display period includes:
and respectively outputting a first driving pulse signal to a light source of the backlight module in each non-driving sub-time period of the display period.
In an exemplary embodiment of the present disclosure, the driving method of the backlight module further includes:
the start time of each display period is obtained.
In an exemplary embodiment of the present disclosure, the driving method of the backlight module further includes:
in any two adjacent display periods, a high level is output to the light source at the starting time of one display period, and a low level is output to the light source at the starting time of the other display period.
In an exemplary embodiment of the present disclosure, the driving method of the backlight module further includes:
acquiring a preset frequency;
determining the frequency of the first driving pulse signal and the frequency of the second driving pulse signal according to the preset frequency; the frequency of the first driving pulse signal is greater than the preset frequency; the frequency of the second driving pulse signal is less than the preset frequency.
In an exemplary embodiment of the present disclosure, determining the frequency of the first driving pulse signal and the frequency of the second driving pulse signal includes:
so that the frequency f of the first drive pulse signal 1 And the frequency f of the second drive pulse signal 2 Satisfies the following relation f 1 *t 1 +f 2 *t 2 ＝f 0 *(t 1 +t 2 )；
Wherein f is 0 Is a preset frequency; t is t 1 A time length of a non-driving period of the display period; t is t 2 Is the time length of the driving period of the display period.
In an exemplary embodiment of the present disclosure, the driving method of the backlight module further includes:
acquiring a preset frequency;
determining the frequency of the first driving pulse signal in each non-driving sub-time period of the display period and the frequency of the second driving pulse signal according to the preset frequency; the frequency of the first driving pulse signal in any non-driving sub-time period of the display period is greater than the preset frequency, and the frequency of the second driving pulse signal is less than the preset frequency.
In an exemplary embodiment of the present disclosure, determining the frequency of the first driving pulse signal in each non-driving sub-period of the display period, and the frequency of the second driving pulse signal includes:
the frequency of the first driving pulse signal in each non-driving sub-period of the display period and the frequency of the second driving pulse signal satisfy the following relation:
wherein f is 0 To a predetermined frequency, f 1i For the frequency, f, of the first drive pulse signal in the ith non-drive sub-period of the display period 2 Is the frequency, t, of the second drive pulse signal 1i Is the time length, t, of the ith non-drive sub-period of the display period 2 The time length of the driving time period of the display period is N, the number of the non-driving sub-time periods in the display period is N, and N is a positive integer not less than 1.
According to a second aspect of the present disclosure, there is provided a driving apparatus of a backlight module, including:
the first driving signal circuit is used for outputting a first driving pulse signal to a light source of the backlight module in the non-driving time period of each display period;
the second driving signal circuit is used for outputting a second driving pulse signal to a light source of the backlight module in the driving time period of each display period;
wherein the frequency of the first driving pulse signal is greater than the frequency of the second driving pulse signal.
In an exemplary embodiment of the present disclosure, the non-driving period of any one display period includes a plurality of non-driving sub-periods;
the first driving signal circuit comprises a plurality of first driving signal sub-circuits which are in one-to-one correspondence with the plurality of non-driving sub-time periods, and any one first driving signal sub-circuit is used for outputting a first driving pulse signal to a light source of the backlight module in the corresponding non-driving sub-time period.
In an exemplary embodiment of the present disclosure, the driving apparatus of the backlight assembly further includes:
and the time sequence acquisition circuit is used for acquiring the starting time of each display period and sending the starting time of each display period to the first driving signal circuit and the second driving signal circuit.
In one exemplary embodiment of the present disclosure, the start timing of the display period is within a non-driving period of the display period, and the first driving signal circuit is configured to:
in any two adjacent display periods, a high level is output to the light source at the starting time of one display period, and a low level is output to the light source at the starting time of the other display period.
According to a third aspect of the present disclosure, a backlight module is provided, which includes the driving device of the backlight module.
According to a fourth aspect of the present disclosure, a display device is provided, which includes the backlight module.
The backlight module, the driving method thereof, the driving device and the display device provided by the disclosure can output a first driving pulse signal to the light source of the backlight module in the non-driving time period of the display period and output a second driving pulse signal to the light source of the backlight module in the driving time period of the display period. The liquid crystal module does not charge the pixels in the non-driving time period of the display period, so that the high frequency of the first driving pulse signal does not cause poor pixel charging. The first driving pulse signal has a higher frequency, so the second driving pulse signal has a lower frequency without reducing the brightness of the backlight module, and the pixel charging failure can be reduced due to the lower frequency of the second driving pulse signal. Therefore, the backlight module, the driving method and the driving device thereof, and the display device can reduce poor pixel charging and improve the display effect of the liquid crystal module on the premise of not reducing the brightness of the backlight module.
Drawings
The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a schematic flow chart of a driving method of a backlight module according to an embodiment of the disclosure.
Fig. 2 is a schematic diagram of a display period of an embodiment of the present disclosure.
Fig. 3 is a timing diagram illustrating a driving method of a backlight module according to an embodiment of the disclosure.
Fig. 4 is a schematic flow chart of determining a frequency of a pulse signal according to an embodiment of the disclosure.
Fig. 5 is a schematic structural diagram of a driving device of a backlight module according to an embodiment of the disclosure.
Fig. 6 is a schematic structural diagram of a driving device of a backlight module according to an embodiment of the disclosure.
The reference numerals of the main elements in the figures are explained as follows:
101. a first drive signal circuit; 102. a second drive signal circuit; 103. a timing acquisition circuit; 104. a preset frequency circuit; 105. a frequency determination circuit; 200. a light source; t, display period; t is 1 A non-driving time period; t is 11 A first non-driving sub-period; t is 12 A second non-driving sub-period; t is a unit of 2 A driving time period; v 1 A first driving pulse signal; v 2 And a second driving pulse signal.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure.
The terms "a," "an," "the," and the like are used to denote the presence of one or more elements/components/parts; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc. The terms "first" and "second", etc. are used merely as labels, and are not limiting on the number of their objects.
The embodiment of the present disclosure provides a driving method of a backlight module, which includes driving a light source of the backlight module to emit light in each display period; as shown in fig. 1, the method for driving the light source of the backlight module to emit light in any display period includes:
step S110, outputting a first driving pulse signal V1 to a light source of the backlight module in a non-driving time period of a display period;
step S120, outputting a second driving pulse signal to a light source of the backlight module in the driving time period of the display period;
the frequency of the first driving pulse signal is greater than that of the second driving pulse signal.
The liquid crystal module does not charge the pixels in the non-driving time period of the display period, so that the high frequency of the first driving pulse signal does not cause poor pixel charging. Because the frequency of the first driving pulse signal is higher, the frequency of the second driving pulse signal can be lower without reducing the brightness of the backlight module, and the lower frequency of the second driving pulse signal can reduce the poor charging of the pixel. Therefore, the driving method of the backlight module can reduce poor pixel charging and improve the display effect of the liquid crystal module on the premise of not reducing the brightness of the backlight module.
The following describes in detail the steps of the driving method of the backlight module according to the embodiment of the present disclosure with reference to the accompanying drawings:
fig. 2 is a schematic diagram of one display period. Here, the display period T in the present disclosure is one frame period of the display device. As can be seen from fig. 2, one display period T includes a driving period T 2 And a non-driving period T 1 . During a driving period T 2 Driving device for inner and outer liquid crystal moduleThe pixel sends out a drive signal, causing the pixel to charge. During a non-driving period T 1 In the liquid crystal module, the liquid crystal module does not send out a driving signal to the pixel, so that the state of the pixel is kept unchanged.
Therefore, in the non-drive period T 1 If the light emitting state of the backlight module is changed, the conductivity of part of the structure of the liquid crystal module is changed; however, the driving device of the liquid crystal module does not send a driving signal to the pixel, and the pixel is not charged, so that the state of the pixel is not affected. Therefore, the backlight module is in the non-driving time period T 1 The internal dimming does not affect the charging of the pixels, and further does not affect the display effect of the liquid crystal module.
During a driving period T 2 If the light emitting state of the backlight module is changed, the conductivity of part of the structure of the liquid crystal module is changed; since the driving device of the liquid crystal module is sending a driving signal to the pixel, the pixel may be charging, and thus the charging rate of the pixel may change. Therefore, during the driving period T 2 In addition, if the light emitting state of the backlight module is adjusted, the charging rate of the pixels of the liquid crystal module may be different, and the display effect of the liquid crystal module may be affected. The driving method of the backlight module improves the non-driving time period T by the first driving pulse signal 1 The frequency of the light-emitting state of the inner backlight module is adjusted, so that the frequency of the second driving pulse signal can be reduced, and the driving time period T of the liquid crystal module is further reduced 2 The frequency of the internal adjustment light-emitting state reduces the difference of the pixel charging rate of the liquid crystal module, and further can improve the display effect of the liquid crystal module.
Non-driving time period T of any display period T 1 A plurality of non-drive sub-periods may be included. For example, as shown in FIG. 3, in one embodiment, the non-driving time period T 1 May comprise a first non-driving sub-period T 11 And a second non-driving sub-period T 12 Wherein the first non-driving sub-period T 11 Is the start time of the display period T, the second non-driving sub-period T 12 At the end of the time ofAt the end of the display period T, in the first non-drive sub-period T 11 And a second non-driving sub-period T 12 A driving period T of a display period T in between 2 。
In one embodiment, the first driving pulse signal V may be output during one or more non-driving sub-periods, respectively 1 To the light source of the backlight module, i.e. the first driving pulse signal V is not output in part of the non-driving sub-period 1 To the light source of the backlight module to simplify the driving method of the backlight module.
In another embodiment, as shown in fig. 3, the first driving pulse signal V is output separately for each non-driving sub-period of the display period T 1 To the light source of the backlight module, i.e. outputting a first driving pulse signal V in each non-driving sub-period of the display period T 1 To the light source of the backlight module. Thus, the first driving pulse signal V can be increased as much as possible 1 Further reducing the second drive pulse signal V 2 The frequency of the liquid crystal module is further improved.
The driving method of the backlight module provided by the present disclosure may further include determining a frequency of the first driving pulse signal and a frequency of the second driving pulse signal. In one embodiment, as shown in fig. 4, the frequency of the pulse signal may be determined by:
step S210, acquiring a preset frequency;
step S220, determining a first driving pulse signal V according to a preset frequency 1 And the second drive pulse signal V 2 The frequency of (d); wherein the first drive pulse signal V 1 The frequency of (a) is greater than a preset frequency; second drive pulse signal V 2 Is less than a predetermined frequency.
Thus, the first driving pulse signal V is determined according to the preset frequency 1 And the second drive pulse signal V 2 The frequency of the backlight module can effectively ensure the light-emitting effect of the backlight module, so that the backlight module can provide stable and proper backlight for the liquid crystal module.
In one embodiment, the method canSo that the first driving pulse signal V 1 Frequency f of 1 And a second drive pulse signal V 2 Frequency f of 2 Satisfies the following relation f 1 *t 1 +f 2 *t 2 ＝f 0 *(t 1 +t 2 )；
Wherein f is 0 Is a preset frequency; t is t 1 A non-driving period T of a display period T 1 The length of time of (c); t is t 2 A drive period T of a display period T 2 The length of time of (c). In the non-drive period T of the display period T 1 First drive pulse signal V 1 Frequency f of 1 The driving method of the backlight module can be simplified.
In another embodiment, the frequency f may be preset according to 0 Determining a first drive pulse signal V 1 The frequency in each non-driving sub-period of the display period T, and a second driving pulse signal V 2 The frequency of (d); wherein the first drive pulse signal V 1 The frequency in any non-driving sub-period of the display period T is greater than the preset frequency, and the second driving pulse signal V 2 Is less than a predetermined frequency. The first driving pulse signal V is applied in different non-driving sub-periods 1 The frequencies of the driving sub-periods can be different, so that the backlight module can more fully and flexibly utilize the non-driving sub-periods to perform dimming, and the driving time period T is further reduced 2 The brightness of the light source is adjusted, and the display effect of the liquid crystal module is further improved.
Alternatively, the first drive pulse signal V may be made 1 The frequency in each non-driving sub-period of the display period T, and a second driving pulse signal V 2 Satisfies the following relation:
wherein f is 0 To a predetermined frequency, f 1i Is a first driving pulse signal V 1 Frequency, f, in the ith non-driving sub-period of the display period T 2 Is the second driving pulse signal V 2 Frequency of (t) 1i Is the time length of the i-th non-drive sub-period of the display period T, T 2 A drive period T of a display period T 2 N is the number of the non-driving sub-periods in the display period T, and N is a positive integer not less than 1.
As shown in FIG. 3, the first driving pulse signal V 1 And a second drive pulse signal V 2 May be a PWM (pulse width modulation) signal. In one embodiment, the first driving pulse signal V 1 And a second drive pulse signal V 2 The high level is used for driving the light source of the backlight module to emit light. Between the high level signals, there may be low level signals, and the low level signals cannot drive the light source of the backlight module to emit light.
The driving method of the backlight module provided by the present disclosure may further include acquiring a start time of each display period T. As shown in fig. 2, since the start time of the previous display period T and the end time of the next display period T are the same time, acquiring the start time of each display period T can acquire the start time and the end time of each display period T. Therefore, according to the driving method of the backlight module, the driving time period T in each display period T can be ensured 2 And a non-driving period T 1 Is stable and accurate, and avoids the long-term accumulated error from causing the drive time period T 2 And a non-driving period T 1 Avoiding the driving time period T in the display period T 2 Outputting a first drive pulse signal V with a higher frequency 1 To the light source.
The driving method of the backlight module provided by the present disclosure may further include: in any two adjacent display periods T, a high level is output to the light source at the start time of one display period T, and a low level is output to the light source at the start time of the other display period T. Therefore, the accumulative superposition of high and low level conversion for a long time can be weakened, and the display stability of the liquid crystal module is further improved.
It should be noted that although the steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that the steps must be performed in this particular order or that all of the depicted steps must be performed to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc., are all considered part of this disclosure.
The embodiment of the present disclosure further provides a driving apparatus for a backlight module, which is used for driving the light source 200 of the backlight module to emit light in each display period T. As shown in fig. 5, the driving apparatus of the backlight module of the present disclosure includes a first driving signal circuit 101 and a second driving signal circuit 102, wherein,
the first drive signal circuit 101 is for a non-drive period T of each display period T 1 Outputting a first driving pulse signal V 1 A light source 200 to the backlight module; the second drive signal circuit 102 is used for driving a period T of each display period T 2 Outputting a second driving pulse signal V 2 A light source 200 to the backlight module; wherein the first drive pulse signal V 1 Is higher than the second drive pulse signal V 2 Of the frequency of (c).
The liquid crystal module is in the non-drive time period T of the display period T 1 The pixel is not charged, so the first driving pulse signal V 1 The higher frequency of (a) does not result in poor charging of the pixels. Due to the first driving pulse signal V 1 Is higher, so that the second drive pulse signal V 2 The frequency of the second driving pulse signal V can be lower without reducing the brightness of the backlight module 2 The low frequency of (3) can reduce pixel charging failures. Therefore, the driving device of the backlight module can reduce poor pixel charging and improve the display effect of the liquid crystal module on the premise of not reducing the brightness of the backlight module.
The following describes each part of the driving device of the backlight module according to the embodiment of the present disclosure in detail with reference to the accompanying drawings:
in one embodiment, the non-driving period T of any display period T 1 Including multiple undriven sub-timesA segment; the first driving signal circuit 101 includes a plurality of first driving signal sub-circuits corresponding to the plurality of non-driving sub-periods one by one, and any one of the first driving signal sub-circuits is configured to output the first driving pulse signal V in the corresponding non-driving sub-period 1 To the light source 200 of the backlight module.
In an embodiment, as shown in fig. 6, the driving apparatus of the backlight module further includes a timing acquisition circuit 103, and the timing acquisition circuit 103 is configured to acquire a start time of each display period T and send the start time of each display period T to the first driving signal circuit 101 and the second driving signal circuit 102.
Since the start timing of the previous display period T and the end timing of the next display period T are the same timing, the timing acquisition circuit 103 can actually acquire the start timing and the end timing of each display period T. Thus, the first and second drive signal circuits 101 and 102 can ensure the drive period T in each display period T 2 And a non-driving period T 1 Is stable and accurate, and avoids the long-term accumulated error from causing the drive time period T 2 And a non-driving period T 1 To avoid the driving time period T in the display period T 2 Outputting a first drive pulse signal V with a higher frequency 1 To the light source 200.
In one embodiment, the start time of the display period T is in the non-driving period T of the display period T 1 The first drive signal circuit 101 is configured to: in any adjacent two display periods T, a high level is output to the light source 200 at the start time of one display period T, and a low level is output to the light source 200 at the start time of the other display period T. Therefore, the accumulated superposition of high and low level conversion for a long time can be weakened, and the stability of the display effect of the liquid crystal module is further improved.
As shown in fig. 6, the driving apparatus of the backlight module of the present disclosure may further include a preset frequency circuit 104 and a frequency determination circuit 105; wherein the content of the first and second substances,
the preset frequency circuit 104 is used for acquiring a preset frequency for backlight modulation of the backlight module; the frequency determining circuit 105 is used for determining the frequency according to the preset frequencyRate, determining the first drive pulse signal V 1 And the second drive pulse signal V 2 The frequency of (d); wherein the first drive pulse signal V 1 The frequency of (a) is greater than a preset frequency; second drive pulse signal V 2 Is less than a predetermined frequency.
Optionally, the frequency determination circuit 105 includes at least an input terminal, a first output terminal, and a second output terminal; wherein, the input end of the frequency determining circuit 105 is connected with the output end of the preset frequency circuit 104 for receiving the preset frequency; a first output terminal of the frequency determination circuit 105 is connected to an input terminal of the first drive signal circuit 101 for outputting the first drive pulse signal V 1 Outputs the frequency of (d) to the first drive signal circuit 101; a second output terminal of the frequency determining circuit 105 is connected to an input terminal of the second driving signal circuit 102 for outputting the second driving pulse signal V 2 To the second drive signal circuit 102.
Thus, the first driving pulse signal V is determined according to the preset frequency 1 The frequency of the second driving pulse signal V2 can effectively ensure the light emitting effect of the backlight module, so that the backlight module can provide stable and proper backlight for the liquid crystal module.
The principle, details and effects of the driving apparatus of the backlight module according to the present disclosure are described in detail in the embodiments of the driving method of the backlight module according to the present disclosure, and the present disclosure is not repeated herein.
The present disclosure also provides a backlight module, which includes any one of the driving devices described in the above embodiments of the driving device of the backlight module. The backlight module may be an edge-lit backlight module, a direct-lit backlight module, a hollow backlight module, or other types of backlight modules, which is not limited in this disclosure.
The driving device adopted by the backlight module of the embodiment of the present disclosure is the same as the driving device of the backlight module in the embodiment of the driving device of the backlight module, and therefore, the driving device has the same beneficial effects, and is not repeated herein.
The display device comprises any one of the backlight modules described in the backlight module embodiments. The display device may be a mobile phone screen, a notebook computer, a computer screen, an electronic advertisement screen or other types of liquid crystal display devices, which is not limited in this disclosure.
The backlight module adopted by the display device of the embodiment of the disclosure is the same as the backlight module in the embodiment of the backlight module, so that the display device has the same beneficial effects, and the description is omitted.
It is to be understood that the disclosure is not limited in its application to the details of construction and the arrangements of the components set forth in the specification. The present disclosure is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications are within the scope of the present disclosure. It should be understood that the disclosure disclosed and defined in this specification extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute various alternative aspects of the present disclosure. The embodiments described in this specification illustrate the best mode known for carrying out the disclosure and will enable those skilled in the art to utilize the disclosure.
Claims (13)
1. A driving method of a backlight module is characterized in that the driving method of the backlight module comprises the following steps:
acquiring a preset frequency;
determining the frequency of the first driving pulse signal and the frequency of the second driving pulse signal according to the preset frequency; the frequency of the first driving pulse signal is greater than the preset frequency; the frequency of the second driving pulse signal is less than the preset frequency;
driving a light source of the backlight module to emit light in each display period; the display period includes a driving period and a non-driving period; in the driving time period, a driving device of the liquid crystal module sends a driving signal to the pixel to charge the pixel; in the non-driving time period, the liquid crystal module does not send out a driving signal to the pixel; the method for driving the light source of the backlight module to emit light in any display period comprises the following steps:
outputting the first driving pulse signal to a light source of a backlight module in a non-driving time period of a display period;
and outputting the second driving pulse signal to a light source of the backlight module in the driving time period of the display period.
2. The driving method of the backlight module according to claim 1, wherein the non-driving period of any display period comprises a plurality of non-driving sub-periods; outputting a first driving pulse signal to a light source of the backlight module in a non-driving time period of a display period comprises:
and respectively outputting a first driving pulse signal to a light source of the backlight module in each non-driving sub-time period of the display period.
3. The method of claim 1 or 2, further comprising:
the start time of each display period is obtained.
4. The method of claim 1 or 2, further comprising:
in any two adjacent display periods, a high level is output to the light source at the starting time of one display period, and a low level is output to the light source at the starting time of the other display period.
5. The method of claim 1, wherein determining the frequency of the first driving pulse signal and the frequency of the second driving pulse signal comprises:
so that the frequency f of the first drive pulse signal 1 And the frequency f of the second drive pulse signal 2 Satisfies the following relation f 1 *t 1 +f 2 *t 2 ＝f 0 *(t 1 +t 2 )；
Wherein f is 0 Is a preset frequency; t is t 1 A time length of a non-driving period of the display period; t is t 2 Is the time length of the driving period of the display period.
6. The method of claim 2, wherein determining the frequency of the first driving pulse signal and the frequency of the second driving pulse signal according to the predetermined frequency comprises:
determining the frequency of the first driving pulse signal in each non-driving sub-time period of the display period and the frequency of the second driving pulse signal according to the preset frequency; the frequency of the first driving pulse signal in any non-driving sub-time period of the display period is greater than the preset frequency, and the frequency of the second driving pulse signal is less than the preset frequency.
7. The method of claim 6, wherein determining the frequency of the first driving pulse signal in each non-driving sub-period of the display period and the frequency of the second driving pulse signal comprises:
the frequency of the first driving pulse signal in each non-driving sub-period of the display period and the frequency of the second driving pulse signal satisfy the following relation:
wherein f is 0 To a predetermined frequency, f 1i Is the frequency, f, of the first drive pulse signal in the ith non-drive sub-period of the display period 2 Is the frequency, t, of the second drive pulse signal 1i Is the time length, t, of the ith non-drive sub-period of the display period 2 Is the time length of the drive period of the display cycle, N isThe number of the non-driving sub-periods in the display period, and N is a positive integer not less than 1.
8. A driving device of a backlight module is characterized in that a display cycle comprises a driving time period and a non-driving time period; in the driving time period, a driving device of the liquid crystal module sends a driving signal to the pixel to charge the pixel; in the non-driving time period, the liquid crystal module does not send out a driving signal to the pixel;
the driving device of the backlight module comprises:
the preset frequency circuit is used for acquiring the preset frequency of the backlight module for backlight modulation;
the frequency determining circuit is used for determining the frequency of the first driving pulse signal and the frequency of the second driving pulse signal according to the preset frequency; the frequency of the first driving pulse signal is greater than the preset frequency; the frequency of the second driving pulse signal is less than a preset frequency;
the first driving signal circuit is used for outputting a first driving pulse signal to a light source of the backlight module in the non-driving time period of each display period;
and the second driving signal circuit is used for outputting a second driving pulse signal to the light source of the backlight module in the driving time period of each display period.
9. The driving apparatus of a backlight module according to claim 8, wherein the non-driving period of any display period comprises a plurality of non-driving sub-periods;
the first driving signal circuit comprises a plurality of first driving signal sub-circuits which are in one-to-one correspondence with the plurality of non-driving sub-time periods, and any one of the first driving signal sub-circuits is used for outputting a first driving pulse signal to a light source of the backlight module in the corresponding non-driving sub-time period.
10. The driving apparatus of a backlight module according to claim 8 or 9, further comprising:
and the time sequence acquisition circuit is used for acquiring the starting time of each display period and sending the starting time of each display period to the first driving signal circuit and the second driving signal circuit.
11. The apparatus according to claim 8 or 9, wherein the start time of the display period is in a non-driving period of the display period, and the first driving signal circuit is configured to:
in any two adjacent display periods, a high level is output to the light source at the starting time of one display period, and a low level is output to the light source at the starting time of the other display period.
12. A backlight module comprising the driving device of the backlight module according to any one of claims 8 to 11.
13. A display device comprising the backlight module of claim 12.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910412318.3A CN111951736B (en) | 2019-05-17 | 2019-05-17 | Backlight module, driving method and driving device thereof and display device |
| PCT/CN2020/086265 WO2020233328A1 (en) | 2019-05-17 | 2020-04-23 | Backlight module and driving method and driving device therefor, and display device |
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| CN201910412318.3A CN111951736B (en) | 2019-05-17 | 2019-05-17 | Backlight module, driving method and driving device thereof and display device |
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| TWI322399B (en) * | 2005-08-17 | 2010-03-21 | Chi Mei Optoelectronics Corp | Method and apparatus for controlling a backlight module |
| CN101083055A (en) * | 2006-05-29 | 2007-12-05 | 启萌科技有限公司 | Control method of back light module unit and control driving mchanism thereof |
| KR20120001282A (en) * | 2010-06-29 | 2012-01-04 | 엘지디스플레이 주식회사 | Driving circuit for liquid crystal display device and method for driving the same |
| CN106981272B (en) * | 2017-05-26 | 2019-08-23 | 京东方科技集团股份有限公司 | Backlight driving method, device and the display panel of display panel |
| CN107424573B (en) * | 2017-07-31 | 2019-09-10 | 明基智能科技（上海）有限公司 | Show the method and display system of image |
| CN109166531A (en) * | 2018-08-10 | 2019-01-08 | 昆山弘锦威电子有限公司 | Drive module and its driving method |
| CN109192150B (en) * | 2018-11-01 | 2021-08-24 | 京东方科技集团股份有限公司 | Backlight module driving method and driving structure and display device |
| CN109326255B (en) * | 2018-11-07 | 2021-01-05 | 苏州佳世达电通有限公司 | Display method and display system for adjusting dynamic blur |
| CN109741712A (en) * | 2019-03-27 | 2019-05-10 | 京东方科技集团股份有限公司 | Backlight driving method and device, display device |
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